It's done in FPGA code (verilog). I created a crude A-to-D converter using a resistor tree into 4 FPGA pins. The resistors are ratioed to give the FPGA indication when the anode voltage is 140,160, 180, or 200V. From there, the FPGA adjusts the duty-cycle of the DC-DC converter to change the voltage. I also use a soft-start on the HV DC to minimize Ldi/dt effects on the wiring, give the HV filter cap (0.3uF) a chance to charge-up, and minimize current-spiking the battery (my naive assumption is chemical reactions in a battery are not instantaneous).
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